Rohm has launched a compact primary LDO that enables maintaining power supply to core functions even when problems occur in vehicle power systems.


Rohm recently announced the development of the 'BD7xxL05G-C series' (BD725L05G-C, BD730L05G-C, BD733L05G-C, BD750L05G-C), a primary LDO regulator with a rated voltage of 45V withstand voltage and 50mA output capability, optimized for sub-power supplies being deployed in vehicle applications with the objective of improving reliability of vehicle power systems, on the 20th.

The new product achieves a compact size (2.9mm×2.8mm) along with high withstand voltage (Max.=45V) and low quiescent current (Typ.=6μA), meeting major required specifications in constructing sub-power supplies that require continuous operation.

Additionally, through Rohm's analog control technology, it realizes stable output voltage even during sudden battery voltage fluctuations.

When compared under the same conditions, standard products generate overshoot exceeding a maximum of 1.2V, requiring large-capacity output capacitors to prevent exceeding the rated voltage of downstream devices such as sub-microcontrollers. However, the new product has only about 0.1V overshoot, enabling downsizing of output capacitors.

This allows for approximately 29% reduction in circuit board area compared to sub-power circuits using standard products, enabling sub-power supply construction with minimal circuit additions.

Additionally, it exhibits high immunity to external noise, and in the ISO 11452-2 antenna irradiation test, output voltage fluctuation is minimal across all frequencies within the test range, reducing engineering costs for noise countermeasures.

The product enables adding power supply with space saving and low quiescent current, and is also optimal as a power supply for applications requiring operation even when the engine is off, beyond sub-power supply applications.

It is useful in △brake systems △body control modules △electric power steering △battery control units △ADAS ECUs △real-time clocks (maintaining time when engine is off) △driving recorders (recording when engine is off) △door handle modules (opening/closing doors when engine is off), and others.

Mass production began in December 2022 with a production capacity of 40,000 units per month.